You can see most folks.
You can hide from most folks.
You can vanish to avoid most folks (or cut them off).
You tank well so can rank alone or with others who will like you tanking.
You can kill pretty much any class. General tactics:

If you really want to get something out of their off hand (shield, wand, weapon) then you need the crunch from kotegaeshi.
If you can't beat them in a straight out fight, then stick with assassinate.
If you need to stop them casting, tiger claw (although be aware it doesn't last long).
Blindness gives you a tactical advantage in many fights.
Mark of the prey removes a lot of the disadvantages of being blind, as well as giving you tactical advantage, and makes it easier to stalk people in groups.

Generally though landing kot and kan will turn melee fights in your favour.
You have endure to help hang in there against magi.